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通过环渤海低平原区2010年4-5月份采集的70组0-60cm土样和水样的全盐量、八大离子和pH值的测试数据,查明了环渤海低平原强蒸发条件下土壤盐分空间特征,并对影响因素进行了相关分析。结果表明:土壤盐分与浅层地下水埋深之间表现为线性负相关,相关系数为0.7312;土壤盐分与地下水矿化度之间可以用指数函数关系进行拟合,决定系数为0.73-0.76;在其他因素不变的情况下,土壤含盐量与蒸发量之间的关系为线性正相关,在土壤积盐因素中有17.3%与蒸发量有关;在浅层地下水埋深较大的中西部地区,两者之间表现为线性负相关,相关系数为0.7021;在浅层地下水埋深较小的滨海平原,两者之间表现为线性正相关,相关系数为0.6035;土壤自身的理化性质对盐分的滞留和阻隔作用同样重要。在空间分布上,随着自西向东浅层地下水埋深逐渐变小、矿化度逐渐增高、降水量越来越大和蒸发量的变化,土壤盐分逐渐增高的趋势也验证了土壤盐分与上述因素之间的相关性。
Based on the data of 70 salts and 0 ~ 8 cm soil samples collected in April-May 2010 in the Bohai Rim Low Plains region and the data of the total salt and eight ions and pH of the water sample, it was found that soil under strong evaporation in the Bohai Rim low plains Spatial characteristics of salt, and the influencing factors were analyzed. The results showed that there was a linear negative correlation between soil salinity and shallow groundwater depth, and the correlation coefficient was 0.7312. The relationship between soil salinity and groundwater salinity could be fitted by exponential function with the coefficient of determination of 0.73-0.76. The other factors remain unchanged, the relationship between soil salinity and evaporation is linearly positive correlation, 17.3% of soil salt accumulation factors and evaporation; in the shallow groundwater depth of the larger central and western regions , The correlation between them is 0.7021; in the coastal plain where the shallow groundwater depth is small, there is a linear positive correlation between the two, the correlation coefficient is 0.6035; the physical and chemical properties of the soil itself have a positive effect on salt The retention and obstruction are equally important. In the spatial distribution, as the depth of groundwater from the west to the east gradually becomes smaller, the salinity gradually increases, the precipitation increases and the evaporation changes, and the trend of soil salinity gradually increases also validates the correlation between soil salinity and the above factors The correlation between.